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Finding the Fourth Proportional to 825.34, 1,138.70 and 562.90

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Solution

The fourth proportional to 825.34, 1,138.70 and 562.90 is: 776.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.34 : 1,138.70 = 562.90 : x
  2. Step 2: Convert to fraction form
    825.34/1,138.70 = 562.90/x
  3. Step 3: Cross multiply
    825.34x = 1,138.70 × 562.90
  4. Step 4: Simplify right side
    825.34x = 640,974.23
  5. Step 5: Solve for x
    x = 640,974.23/825.34
  6. Step 6: Final answer
    x = 776.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.